What affected the development of ancient india the most

The civilization of Ancient India was able to develop to a high level because of the natural barriers that protected it and somewhat guranteed its safety.

Explanation:

Ancient India had one of the first civlizations that developed in the Old World, part of the so called river valley civilization. The civilization in queastion is the Hindus Valley Civilization. This civilization is not just known for its great developement and being highly advanced for the time period in which it existed, but also for being the most peaceful one without a single evidence that suggests there have been a single military conflict, be it with invaders or internal conflicts.

The explanation for this is very simple. The people of this civilization lived in a safe environment because of the protection of the biggest moutain chain in the world, the Himalayas. The Himalays were simply a barrier that invading forces were not able to go through, meaning that the Hindus Valley Civilization was safe from attacks and its people could focus only on the development of the society, ingage into science, phylosophy, architecture, crafts, etc.